If you want news about Lady Gaga, there’s plenty out there. But if you want information of a different kind, you can follow organisations such as the Royal Society, the Wellcome Trust, Guardian Science, the New York Times, Nature, etc. etc. Most scientific organisations, newspapers, and science journals are on Twitter, and by following them you have an up-to-date news stream about their activities.

You may also want to take a look at a guide to Microblogging produced by JISC. Check out their Ten things to try at the bottom of their post.